/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.paimon.predicate;

import java.util.List;
import java.util.stream.Collectors;

/** A {@link PredicateVisitor} to visit functions. */
public interface FunctionVisitor<T> extends PredicateVisitor<T> {

    @Override
    default T visit(LeafPredicate predicate) {
        return predicate.function().visit(this, predicate.fieldRef(), predicate.literals());
    }

    @Override
    default T visit(CompoundPredicate predicate) {
        return predicate
                .function()
                .visit(
                        this,
                        predicate.children().stream()
                                .map(p -> p.visit(this))
                                .collect(Collectors.toList()));
    }

    // ----------------- Unary functions ------------------------

    T visitIsNotNull(FieldRef fieldRef);

    T visitIsNull(FieldRef fieldRef);

    // ----------------- Binary functions ------------------------

    T visitStartsWith(FieldRef fieldRef, Object literal);

    T visitLessThan(FieldRef fieldRef, Object literal);

    T visitGreaterOrEqual(FieldRef fieldRef, Object literal);

    T visitNotEqual(FieldRef fieldRef, Object literal);

    T visitLessOrEqual(FieldRef fieldRef, Object literal);

    T visitEqual(FieldRef fieldRef, Object literal);

    T visitGreaterThan(FieldRef fieldRef, Object literal);

    // ----------------- Other functions ------------------------

    T visitIn(FieldRef fieldRef, List<Object> literals);

    T visitNotIn(FieldRef fieldRef, List<Object> literals);

    // ----------------- Compound functions ------------------------

    T visitAnd(List<T> children);

    T visitOr(List<T> children);
}
